Peripheral Nervous System

• PNS

  • All nervous tissue outside of the CNS

  • Consists of sensory nerves that conduct impulses from receptors to CNS and motor nerves that conduct impulses from CNS to effectors.

  • Motor nerves are divided into

  • Somatic nervous system: conducts nerve impulses from CNS to voluntary muscles
  • Autonomic nervous system: conducts nerve impulses from CNS to involuntary muscles and glands.

  Functions:

  • Conducts impulses from receptors to CNS, along sensory neurons.
  • Conduct impulses from CNS to effectors, along motor neurons.
• Autonomic System(Part of PNS)

  Functions

  • Control heart rate
  • Control blood pressure
  • Controls peristalsis
• Structure and functioning of nerves

  • All nerves consist of nerve fibre, held together by connective tissue.
  • Blood vessels occur between these bundles, providing fibres with oxygen and nutrients, & removing waste.